Objective To investigate the incidence of small for gestational age (SGA) and the perinatal correlation factors in western Guangxi.

目的探讨桂西地区小于胎龄儿（SGA）发生率及围生相关因素。

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To study the levels of serum leptin and their roles on the growth of children aged 2~7 years old with small for gestational age(SGA).

瘦素参与2~7岁儿童的生长过程，并可作为评价此阶段儿童营养状况的指标。

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The prevalence of obesity for children born pre term was 18%, higher than the children born small for gestational age(8.8%) significantly.

早产低体重儿的肥胖发生率为18% ，明显高于足月小样儿（8.8% ）。

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